Best Known (21, 21+5, s)-Nets in Base 5
(21, 21+5, 15627)-Net over F5 — Constructive and digital
Digital (21, 26, 15627)-net over F5, using
- net defined by OOA [i] based on linear OOA(526, 15627, F5, 5, 5) (dual of [(15627, 5), 78109, 6]-NRT-code), using
- OOA 2-folding and stacking with additional row [i] based on linear OA(526, 31255, F5, 5) (dual of [31255, 31229, 6]-code), using
- discarding factors / shortening the dual code based on linear OA(526, 31256, F5, 5) (dual of [31256, 31230, 6]-code), using
- trace code [i] based on linear OA(2513, 15628, F25, 5) (dual of [15628, 15615, 6]-code), using
- construction X applied to Ce(4) ⊂ Ce(3) [i] based on
- linear OA(2513, 15625, F25, 5) (dual of [15625, 15612, 6]-code), using an extension Ce(4) of the primitive narrow-sense BCH-code C(I) with length 15624 = 253−1, defining interval I = [1,4], and designed minimum distance d ≥ |I|+1 = 5 [i]
- linear OA(2510, 15625, F25, 4) (dual of [15625, 15615, 5]-code), using an extension Ce(3) of the primitive narrow-sense BCH-code C(I) with length 15624 = 253−1, defining interval I = [1,3], and designed minimum distance d ≥ |I|+1 = 4 [i]
- linear OA(250, 3, F25, 0) (dual of [3, 3, 1]-code), using
- discarding factors / shortening the dual code based on linear OA(250, s, F25, 0) (dual of [s, s, 1]-code) with arbitrarily large s, using
- construction X applied to Ce(4) ⊂ Ce(3) [i] based on
- trace code [i] based on linear OA(2513, 15628, F25, 5) (dual of [15628, 15615, 6]-code), using
- discarding factors / shortening the dual code based on linear OA(526, 31256, F5, 5) (dual of [31256, 31230, 6]-code), using
- OOA 2-folding and stacking with additional row [i] based on linear OA(526, 31255, F5, 5) (dual of [31255, 31229, 6]-code), using
(21, 21+5, 31256)-Net over F5 — Digital
Digital (21, 26, 31256)-net over F5, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OA(526, 31256, F5, 5) (dual of [31256, 31230, 6]-code), using
- trace code [i] based on linear OA(2513, 15628, F25, 5) (dual of [15628, 15615, 6]-code), using
- construction X applied to Ce(4) ⊂ Ce(3) [i] based on
- linear OA(2513, 15625, F25, 5) (dual of [15625, 15612, 6]-code), using an extension Ce(4) of the primitive narrow-sense BCH-code C(I) with length 15624 = 253−1, defining interval I = [1,4], and designed minimum distance d ≥ |I|+1 = 5 [i]
- linear OA(2510, 15625, F25, 4) (dual of [15625, 15615, 5]-code), using an extension Ce(3) of the primitive narrow-sense BCH-code C(I) with length 15624 = 253−1, defining interval I = [1,3], and designed minimum distance d ≥ |I|+1 = 4 [i]
- linear OA(250, 3, F25, 0) (dual of [3, 3, 1]-code), using
- discarding factors / shortening the dual code based on linear OA(250, s, F25, 0) (dual of [s, s, 1]-code) with arbitrarily large s, using
- construction X applied to Ce(4) ⊂ Ce(3) [i] based on
- trace code [i] based on linear OA(2513, 15628, F25, 5) (dual of [15628, 15615, 6]-code), using
(21, 21+5, large)-Net in Base 5 — Upper bound on s
There is no (21, 26, large)-net in base 5, because
- 3 times m-reduction [i] would yield (21, 23, large)-net in base 5, but